According to Mayo Clinic, some controllable risk factors for infectious diseases include hygiene, vaccinations and food preparation methods. Changing these factors can have a significant impact on reducing the risk of contracting an infectious disease.
I think its true!! hope this helps
The bodies second line of defense is its immune system (remember, the first line of defense is the skin) The immune system includes white blood cells, etc etc...... It takes affect when a virus or germ enters the body.. basically any 'foreign cell'..... and the immune system would respond and kill it
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Hopes this helps (:
I believe it is the first option
